A little help with the Alyx Replacement Model plz

I wanted to play HL all over again… starting with HL1 … BlueShift… Oppossing force… to HL2 EP 2…

Also I decided to try this model:

and I get the following results:

http://img195.imageshack.us/img195/4273/75617488.jpg

Any idea on what the heck is wrong with it?

[editline]10:04AM[/editline]

Well another pic…

Just noticed… when I move away from her it seems to get worse…

http://img12.imageshack.us/img12/8853/39422273.jpg

And when I move towards her it looks a bit better ಠ_ಠ

Seems like the old and the new models are colliding with each other.

Is there a way to fix that?

I replaced the following files on the Model folder:

alyx.dx80
Alyx.dx90
alyx.mdl
alyx.phy
Alyx.sw
Alyx.vvd

and added to Materials:

Adriana
FF_Humans
VALYX

Is there something else I need to do?.. my guess was that by replacing the files, the old model should be gone [ I made a backup in case something went wrong ]

Thanks ಠ_ಠ